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  1. #1
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    Crank Brothers Egg Beater 4ti Tuning. 115gr (Carbon spring)/ 122gr (Ti spring)

    Hi,

    You may have seen the 5.97kg Cannondale Flash that S. Roth presented in the Eurobike (pics 1 and 2)...that bike had a pair of Crank Brothers EB 4ti that weighed 139.2gr. A very nice weight but we still can push the boundaries a bit more.

    This is a pic of a disassembled CB EB 4ti already tuned (pic 3) but still a bit "heavy". Basically, we have to modify every single part (weights per pedal).

    Normal weight (pic 4)

    First, we work with the main wings polishing the body and shaving the combs of the ends of the body (pics 5 and 6). 3.3gr less

    The secundary wings have not combs but polishing them we can reduce 0.5gr

    The body where the spring is placed is made of Ti and weighs 5.4gr. In light-bikes.de we can get an aluminium version(<80kg) that weighs 3.5gr/piece (pics 7 and 8). 1.9gr less

    This is the main change, the normal spring is made of steel and weighs 11.5gr. Coparni have made a carbon version with an amazing weight of 1.3gr (pics 9 and 10). 10.2gr less

    The only part that we havenīt changed is the axle. The normal one is made of Ti6Al4V, weighs 31.5gr with a length of 91.58mm. We can get a Ti6Q2 version in http://www.titaniumspindles.com that measures 88mm and weighs 28.65gr (pic 11). We reduce the Q-Factor 7.16mm and 2.85gr

    I havenīt found any pic of the bearings of these pedals but I use these of a Speedplay Zero that are about the same size. Changing the bearing body that is made of steel to a plastic one (pics 12 and 13) we reduce 2.5gr

    Next, changing the normal bearings to a Full Ceramic version (pics 14 and 15) we reduce 1gr

    The only nut of the pedal is made of steel but we can find aluminium security nuts in TorontoCycles. We reduce 1.9gr

    Finally, changing the pedal cap to a plastic one we reduce 0.9gr

    Total weight, (83-25.1)x2 = [SIZE="7"]115.8gr[/SIZE]
    Attached Thumbnails Attached Thumbnails Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-s__roth_flash_specs.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-26.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-dsc05200.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-four_ti_166.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-k-img_4646x.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-dsc05223.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-arpjh8fi.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-dsc05435.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-federn_eggbeater_stahl.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-aa121450ba5d11de8b63bedb4d85e374.jpg  

    Last edited by Epic-o; 12-10-2009 at 02:27 PM.

  2. #2
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    Last pics....

    And a video of the carbon spring:

    Attached Thumbnails Attached Thumbnails Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-p1000237_321.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-p1000238_206.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-img_0008_339.jpg  

    Crank Brothers Egg Beater 4ti. Extensive Tuning:115gr-img_0009_145.jpg  

    Attached Images Attached Images  

  3. #3
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    and the extra cost for all of this ????

  4. #4
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    fantastic work Epic-o, best post here for a while

    carbon springs? simply amazing.

  5. #5
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    Wow.

    I <3 this forum.
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  6. #6
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    wow, for all the work you put into those you will be pretty sad when you bash them into a rock.

  7. #7
    Forging Elite Awesomeness
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    Is anyone reading that build list in the first pic?!?! Can we see pics of the whole bike or is it posted elsewhere?

  8. #8
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    http://www.light-bikes.de/website/ne...robike-special

    about half way down there is a pic.


    So just by changing the springs to carbon you have a 4ti weighing less than 150g.
    How much is those carbon springs?

  9. #9
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    Is there a pic of the actual completed pedals, weighed.. I dont see one....?

  10. #10
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    I havenīt tuned my CB 4TI....

    I simply want to show you that these pedals have a lot of tuning potential

  11. #11
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    Wow

  12. #12
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    the carbon spring seems pretty weak to me
    anyone have more info?
    It is possible for rice to absorb other odors in storage. Or could be the quality of water in it was prepared. Mahatma Rice

  13. #13
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    ZOMG! WANT!!

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  14. #14
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    I'm speechless...

  15. #15
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    Does anyone know how to completely disassemble eggbeaters with regular tools? How do you get the spring out? I want to tune my 2ti. I already have Ti spindles that I got from ebay. Thanks guys.

  16. #16
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    Quote Originally Posted by morrisgarages
    Does anyone know how to completely disassemble eggbeaters with regular tools? How do you get the spring out? I want to tune my 2ti. I already have Ti spindles that I got from ebay. Thanks guys.
    servicing info here: http://pedaldamnit.blogspot.com/2007...servicing.html

    the spring separates from the "wings" when you tap out the inner sleeve, newer CB pedals are easier to dismantle than assemble but its worth the effort, make sure you have a rebuild kit handy as it always destroys the seals

  17. #17
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    so can those 'tuned' eggbeaters even make it through one ride before a rebuild?
    2011 Yeti 575 - 2015 Fox Float 36 RC2 160 / Fox Float X - 30.6 lbs

  18. #18
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    Quote Originally Posted by Cheers!
    Wow
    I'll second that

  19. #19
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    Quote Originally Posted by oldassracer
    the carbon spring seems pretty weak to me
    anyone have more info?
    Still a proto but...

    s.wetz@carbonschmiede.de

  20. #20
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    Quote Originally Posted by culturesponge
    servicing info here: http://pedaldamnit.blogspot.com/2007...servicing.html

    the spring separates from the "wings" when you tap out the inner sleeve, newer CB pedals are easier to dismantle than assemble but its worth the effort, make sure you have a rebuild kit handy as it always destroys the seals
    Yeah but it's a bit of a ***** to get them back together without ruining the superskinny o-rings.
    I managed to put blue springs in my 4tis, but I screwed up one o-ring.

  21. #21
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    just got confirmation of shipment of the ward industries spindles
    It is possible for rice to absorb other odors in storage. Or could be the quality of water in it was prepared. Mahatma Rice

  22. #22
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    Thanks for the help guys. I'll try it out first on my SL before I try it on my 2Ti. Anyone knows where I can get titanium springs for my 2ti? I'm sorry but carbon springs for my egg beaters could be pushing it. It does look too soft. I already broke a spring on my 2ti and had to send it back to CB for warranty replacement. Took them 7 months to ship it back to me.=/ I had to buy an SL while waiting for my 2ti.

  23. #23
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  24. #24
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    Too bad I can't read german or whatever that language was.

  25. #25
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    Sometimes I think this forum should be re-named "death wish".

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